The Kinship is cousin of King Pavlo and second cousin of King Constantine.

NO, Prince Philip and King Pavlos were firsts cousins, because their fathers were brothers.
Prince Philip is uncle for King Kostantin and Charles etc are second cousins with King Kostantin etc
Consequently King Kostantin's children are second nefews of Prince Philip.
William and Pavlos, Nikolaos& Co are third cousins.

You are someone's aunt/uncle is you are his father/mother's sibling, not his parent's cousin. For instance, Charles and Anne are siblings; therefore Anne is William's aunt and Charles is Zara's uncle. William and Zara are each other's (first) cousin. This will not make William an uncle to Zara's children - he will continue to be a cousin, just more distantly. He will be a first cousin, once removed, to Zara Junior. (Charles, however, will be Zara Junior's great-uncle.)

In order to be a second cousin, your parents have to be first cousins. Zara Junior and William Junior will be second cousins. Constantine and Charles are second cousins because their fathers were first cousins. But Philip and Constantine are not second cousins - second cousins, first cousins, third cousins, and so on require you to be on the same line on the family tree. Philip and Constantine are first cousins, once removed - like William and Zara's children will be.

Oh Maura...this is easier to trace and you are so correct..
Can you imagine how they were figuring out the degrees of family ties between different royals when the bride and groom were also first cousins?

You are someone's aunt/uncle is you are his father/mother's sibling, not his parent's cousin. For instance, Charles and Anne are siblings; therefore Anne is William's aunt and Charles is Zara's uncle. William and Zara are each other's (first) cousin. This will not make William an uncle to Zara's children - he will continue to be a cousin, just more distantly. He will be a first cousin, once removed, to Zara Junior. (Charles, however, will be Zara Junior's great-uncle.)

In order to be a second cousin, your parents have to be first cousins. Zara Junior and William Junior will be second cousins. Constantine and Charles are second cousins because their fathers were first cousins. But Philip and Constantine are not second cousins - second cousins, first cousins, third cousins, and so on require you to be on the same line on the family tree. Philip and Constantine are first cousins, once removed - like William and Zara's children will be.

Sorry I disagree with you, but In think each country and language has its rules.
Philip and King Pavlos were first cousins, so Prince Philip will never be cousin with King Kostantin he is his uncle in second degree.
Charles and Kostantins kids are cousins, definitely.
Maybe in US you have another definition of family links, all is question of definition.

Sorry I disagree with you, but In think each country and language has its rules.
Philip and King Pavlos were first cousins, so Prince Philip will never be cousin with King Kostantin he is his uncle in second degree.
Charles and Kostantins kids are cousins, definitely.
Maybe in US you have another definition of family links, all is question of definition.

I think the same way, at less here in Argentina we see the family links in your way fandesacs

Not much, as it's a very short article. It says that - as she has to act as
regent as representative of Queen Margrethe and the other family members
that will attend the wedding or be elsewhere - she won't attend the wedding
but has visited the church before. In June she made a short vacation in
Greece visiting her sister:

"And twice we were inside and saw the church where the wedding will take
place, and I took several pictures. It is a very sweet little church. I think it
will be a very different wedding and very charming", she said.